Oxidative degradation of organic acid conjugated with sulfite oxidation in flue gas desulfurization: products, kinetics and mechanism
Organic acid degradation conjugated with sulfite oxidation has been studied under flue gas desulfurization (FGD) conditions. The oxidative degradation constant k/sub 12/ is defined as the ratio of organic acid degradation rate and sulfite oxidation rate times the ratio of the concentration of dissolved S(IV) and organic acid. It is not significantly affected by pH or dissolved oxygen in the absence of manganese or iron. However, k/sub 12/ is increased by certain transition metals such as Fe, Co, and Ni and is decreased by Mn and halides. Lower dissolved S(IV) magnifies these effects. A free radical mechanism was proposed to describe the kinetics. Hydroxy and sulfonated carboxylic acids degrade approximately 3 times slower than saturated dicarboxylic acids, while maleic acid, an unsaturated dicarboxylic acid, degraded an order of magnitude factor. A wide spectrum of degradation products of adipic acid were found, including carbon dioxide - the major product - smaller dicarboxylic acids, monocarboxylic acids, other carbonyl compounds, and hydrocarbons. 30 references, 7 figures, 7 tables.
- Research Organization:
- Univ. of Texas, Austin
- OSTI ID:
- 6676465
- Report Number(s):
- CONF-850417-
- Journal Information:
- Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 21:3; ISSN ESTHA
- Country of Publication:
- United States
- Language:
- English
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Oxidative degradation of organic acids conjugated with sulfite oxidation in flue gas desulfurization
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Lignite
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010900 -- Coal
Lignite
& Peat-- Environmental Aspects
AIR POLLUTION CONTROL
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
DATA
DECOMPOSITION
DESULFURIZATION
EXPERIMENTAL DATA
FLUE GAS
GASEOUS WASTES
INFORMATION
KINETICS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
SULFITES
SULFUR COMPOUNDS
WASTES